package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.DistanceUtil;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.webSocket.WebSocketServer;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;
import org.springframework.web.bind.annotation.PathVariable;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class OrderServiceImpl implements OrderService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WeChatPayUtil weChatPayUtil;
    @Autowired
    private WebSocketServer webSocketServer;
    @Autowired
    private DistanceUtil distanceUtil;

    /**
     * 提交订单
     * @param ordersSubmitDTO
     * @return
     */
    @Override
    @Transactional
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {
        // 处理各种业务异常（地址簿为空，购物车数据为空）
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        System.out.println(addressBook);

        if(addressBook == null){
            // 地址簿为空，抛出业务异常
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }

        // districtName
        // 获取地址簿的address
        String address = addressBook.getProvinceName() + addressBook.getCityName() + addressBook.getDistrictName() + addressBook.getDetail();
        try {
            distanceUtil.getLocation(address);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

        // 查询当前用户的购物车数据
        ShoppingCart shoppingCart = ShoppingCart.builder().userId(BaseContext.getCurrentId()).build();
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if (shoppingCartList == null || shoppingCartList.size() == 0){
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }
        // 向订单表插入一条数据
        Orders orders = Orders.builder()
                .orderTime(LocalDateTime.now())
                .payStatus(Orders.UN_PAID)
                .status(Orders.PENDING_PAYMENT)
                .number(String.valueOf(System.currentTimeMillis()))
                .phone(addressBook.getPhone())
                .consignee(addressBook.getConsignee())
                .userId(BaseContext.getCurrentId())
                .address(addressBook.getDetail())
                .build();

        BeanUtils.copyProperties(ordersSubmitDTO,orders);
        orderMapper.insert(orders);

        // 向订单明细表插入n条数据
        List<OrderDetail> orderDetails = new ArrayList<>();
        for (ShoppingCart cart : shoppingCartList) {
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(cart,orderDetail);
            orderDetail.setOrderId(orders.getId());
            orderDetails.add(orderDetail);
        }
        orderDetailMapper.insertBatch(orderDetails);

        // 清空当前用户的购物车数据。
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());

        // 封装VO对象并返回
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderTime(orders.getOrderTime()).
                orderNumber(orders.getNumber()).
                orderAmount(orders.getAmount()).build();

        return orderSubmitVO;
    }

    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);

        //调用微信支付接口，生成预支付交易单
        JSONObject jsonObject = weChatPayUtil.pay(
                ordersPaymentDTO.getOrderNumber(), //商户订单号
                new BigDecimal(0.01), //支付金额，单位 元
                "苍穹外卖订单", //商品描述
                user.getOpenid() //微信用户的openid
        );

        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }

        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        return vo;
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {

        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(outTradeNo);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);

        // 通过WebSocket向客户端推送消息(json) type orderId content
        HashMap map = new HashMap();
        map.put("type",1);
        map.put("orderId",ordersDB.getId());
        map.put("content","订单号:"+ordersDB.getNumber());
        webSocketServer.sendToAllClient(JSON.toJSONString(map));
    }

    /**
     * 历史订单查询
     * @return
     */
    @Override
    public PageResult historyOrderQuery(OrdersPageQueryDTO ordersPageQueryDTO) {

        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        Page<Orders> pageQ = orderMapper.historyOrderQuery(ordersPageQueryDTO);
        List<OrderVO> orderVOList = getALlOrderVOlist(pageQ);
        return new PageResult(pageQ.getTotal(), orderVOList);
    }

    private List<OrderVO> getALlOrderVOlist(Page<Orders> page) {
        List<OrderVO> orderVOList = new ArrayList<>();
        List<Orders> ordersList = page.getResult();
        for (Orders orders : ordersList) {
            OrderVO orderVO = new OrderVO();
            BeanUtils.copyProperties(orders, orderVO);
            Long orderId = orders.getId();
            List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orderId);
            orderVO.setOrderDetailList(orderDetailList);
            orderVOList.add(orderVO);
        }
        return orderVOList;
    }


    /**
     * 订单搜索
     * @param ordersPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(OrdersPageQueryDTO ordersPageQueryDTO) {
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        // 部分订单状态，需要额外返回订单菜品信息，将orders转化为OrderVO
        List<OrderVO> orderVOList = getOrderVOlist(page);
        return new PageResult(page.getTotal(), orderVOList);
    }

    /**
     * 各个状态的订单数量统计
     * @return
     */
    @Override
    public OrderStatisticsVO statistics() {
        return orderMapper.statistics();
    }

    @Override
    public OrderVO getById(@PathVariable Long id) {
        OrderVO orderVO =orderMapper.getById(id);
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);
        orderVO.setOrderDetailList(orderDetailList);
        return orderVO;
    }

    @Override
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        orderMapper.confirm(ordersConfirmDTO);
    }

    @Override
    public void delivery(Long id) {
        orderMapper.delivery(id);
    }

    @Override
    public void complete(Long id) {
        orderMapper.complete(id);
    }

    /**
     * 取消订单
     * @param ordersCancelDTO
     */
    @Override
    public void cancel(OrdersCancelDTO ordersCancelDTO) {
        orderMapper.cancel(ordersCancelDTO);
    }

    @Override
    public void userCancel(Long id) {
        orderMapper.userCancel(id);
    }

    @Override
    public void refuse(OrdersRejectionDTO ordersRejectionDTO) {
        orderMapper.rejection(ordersRejectionDTO);
    }

    @Override
    public OrderVO detail(Long id) {
        OrderVO orderVO =orderMapper.getById(id);
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);
        orderVO.setOrderDetailList(orderDetailList);
        return orderVO;
    }

    /**
     * 再来一单
     *
     * @param id
     */
    public void repetition(Long id) {
        // 查询当前用户id
        Long userId = BaseContext.getCurrentId();

        // 根据订单id查询当前订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        // 将订单详情对象转换为购物车对象
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
            ShoppingCart shoppingCart = new ShoppingCart();

            // 将原订单详情里面的菜品信息重新复制到购物车对象中
            BeanUtils.copyProperties(x, shoppingCart, "id");
            shoppingCart.setUserId(userId);
            shoppingCart.setCreateTime(LocalDateTime.now());

            return shoppingCart;
        }).collect(Collectors.toList());

        // 将购物车对象批量添加到数据库
        shoppingCartMapper.insertBatch(shoppingCartList);
    }

    /**
     * 催单
     * @param id
     */
    @Override
    public void reminder(Long id) {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(id);

        // 校验订单是否存在
        if (ordersDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        /*
        HashMap map = new HashMap();
        map.put("type",1);
        map.put("orderId",ordersDB.getId());
        map.put("content","订单号:"+ordersDB.getNumber());
        webSocketServer.sendToAllClient(JSON.toJSONString(map));
         */
        HashMap map = new HashMap();
        map.put("type",2);
        map.put("orderId",id);
        map.put("content","订单号:"+ordersDB.getNumber());
        webSocketServer.sendToAllClient(JSON.toJSONString(map));
    }

    /**
     *
     * @param page
     * @return
     */
    private List<OrderVO> getOrderVOlist(Page<Orders> page){
        // 需要返回订单菜品信息，自定义OrderVO相应结果
        List<OrderVO> orderVOList = new ArrayList<>();
        List<Orders> ordersList = page.getResult();
        if(!CollectionUtils.isEmpty(ordersList)){
            for (Orders orders : ordersList) {
                // 将公共字段复制到OrderVO
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders,orderVO);

                // 获取订单菜品信息
                String orderDishes = getOrderDishesStr(orders);

                // 将订单菜品信息封装到orderVO，并添加到orderVOList
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }
        return orderVOList;
    }

    /**
     * 根据订单id获取菜品信息字符串
     * @param orders
     * @return
     */
    private String getOrderDishesStr(Orders orders){
        // 查询订单菜品详细信息（订单中的菜品和数量）
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());
        String orderDishes = orderDetailList.stream()
                .map(x -> x.getNumber() + "*" + x.getName() + ";")
                .collect(Collectors.joining(""));
        return orderDishes;
    }
}
